html,body{
    margin: 0;
    padding: 0;
}

.main{
    width: 4040px;
    height: 4040px;
    margin: 20px auto;
    border: 1px solid #e8e8e8;
    /*background-color: #e8e8e8;*/
}
canvas{
    margin: 0;
    padding: 0;
}